Double-bolt lock.



G. BLUME.

DOUBLE BOLT LOCK.

APPLICATION FILED IUNE l. 1916.

Patented Jan. 30, 191?.

atto: ne

GEORG-E BLUME, 0F SIBERIA, INDIANA.

n DOUBLE-BOLT LOCK.

Application led June 1, 1916.

To aZZ wham t may concern:

Be it known that l, Gnonen BLUME, a citizen of the United States, residing at Siberia, in the county of Ferry, State of lindiana, have invented a new and useful Double-Bolt Lock; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to a double bolt door lock, and has for its object to provide a device of this character which embodies novel features of construction whereby the door may be secured by either a single bolt or a double bolt, one of the bolts having a peculiar locking action so that it can be released by a person familiar with the mechanism, without the use of a key, while the other bolt may be arranged so that it can only be released with a key.

Further objects of the invention are to provide a double bolt lock which is compaia tively simple and inexpensive in its construction, which can be easily operated by a person familiar with the mechanism, which can be readily applied to any door or closure, and which is not liable to get out of adjustment or repair.

With these and other objects in view, the invention consists in certain novel combinations and arrangements of the parts as will more fully appear as the description proceeds, the novel features thereof being point` ed out in the appended claims.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawings, in which Figure l is a front, elevation of the lock and portions of the inside of the door and door frame to which the lock is applied, both of the locking bars being shown in operative position. Fig. 2 is a similar view, the casing appearing` in section and the lower locking bar being shown in a retracted position. Fig. 3 is a similar view showing the upper looking bar as moved rearwardly for the purpose of forcing the lower locking bar into operative position. Fig. 4 is a similar view, both locking bars appearing in operative position. Fig. 5 is a transverse sectional view through the lock, showing the upright lever which opera tively connects the upper and lower locking bars. Fig. 6 is a similar view, showing the handle for manip- Specification of Letters Patent.

ria-treated aan. so, reir.

Serial No. 101,059.

ulating the upper locking bar. Fig. 7 is a front elevation of the lock and portions of the inside of the door and door frame to which it is applied, showing a modified form of the invention, the lock casing being broken away and shown in section, and both of the locking bars appearing in operative position. Fig. 8 is a view similar to Fig. 7, showing the upper locking bar as moved rearwardly in the initial step incident to retracting the lower locking bar. Fig. 9 is a similar view showing the final movement of the upper locking bar incident to retracting the lower locking bar, both of the locking bars appearing in an inoperative position.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the saine reference characters.

i Referring to the drawings, the numeral 1 designates the lock casing `which is designed to be applied to the swinging edge of a door 2, said lock casingh being subdivided by a hori- Zontal partition 3 into an upper chamber within which an upper locking bolt or bar 4 is slidably mounted and a lower chamber within which a lower locking bolt or bar 5 is slidably mounted. The nose of the upper bar 4 has the lower corner thereof beveled at 4a, and a tortuous slot 6 is formed in the end of the said upper bar, said slot opening vertically downward through the lower edge o f the upper bar, at a point just to the rear of the beveled nose 4LL thereof, as indicated at 6a. rlhis tortuous slot is formed with a number of angular corners, and a pocket or notch 6b is arranged at each of these corners opposite the end of one of the straight portions of the slot, so that it is diiicult for a person unfamiliar with the mechanism to manipulate the bar to thread a stem through the slot without being able to see the same. The upper portion of the tortuous slot extends longitudinally of the bar, as indicated at 6, and a vertical portion 6d extends downwardly from the rear end of the horizontal upper portion 6". rllhe nail or stem 7 preferably extends across a keeper 7 which is applied to a suitable point on the inside of the door casing 8, said stem 7 being adapted to be positioned within the vertical rear end portion 6d of the tortuous slot when the upper bar 4 is in locking position. For manipulating the upper bar 4 a handle 9 is provided, said handle projecting laterally from the bar and extending loosely through an opening 10 in the door 2. The bar 4 has sulieient play in the upper compartment of the latch casing to admit of the necessary manipulation thereof to thread the nail or stem 7 into and out of the tortuous slot 6 when locking and unlocking the door.

The lower locking bar 5 may or may not be moved into locking position, depending upon whether the operator is willing to depend upon the upper bar 4 alone, or whether he wishes an additional degree of security. This lower bar 5 slides freely into and out of locking position, and when projected forward enters the keeper 7a to lock the door in a closed position. Then the lower locking bar 5 is thus moved into locking position, the lower end of the upright lever 16 is. engaged by a spring detent 12 which springs against a stop shoulder 12a, and this detent can only be released by the use of a key 13., A suitable key-hole 14 is provided in the doorQ, and by inserting the key through the said key-hole and turning the same in the usual manner the spring detent 12 may be disengaged from the lever 16. The lower locking bar 5 may then be retracted, and a spring 15 is preferably pr vided for automatically withdrawing it into inoperative position as soon as the detent is released, al though the use of a spring is not absolutely necessary.

An upright lever 16 is pivotally mounted at an intermediate point in its length upon the lock easing 1', as indicated at 17, the upper end thereof extending into the upper compartment of the lock casing and having a notched seat 18 in the extremity thereof for engagement with a pin 19 upon the upper locking bar 4, while the lower end of the upright lever has a pin and slot connection 20 with the lower locking bar 5. The upper locking bar 4 can thus be moved forwardly into locking position independently of the lower bar 5 and this is done when it is not desired to use a second locking bar. However, when an additional degree of security is desired, the upper locking bar 4 is moved rearwardly before being shoved forward into a locking position. Upon the rearward movement of the upper looking bar 4, the pin 19 thereon engages the notched seat 18 in the upper end of the upright lever 16, thereby swinging Vthe said lever and advancing the lower locking bolt 5 into locking position. The spring detent 12 then engages the lever 16 to retain the said locking bar 5 in operative position, and the upper locking bar 4'can be manipulated into a locking position, as in the previous instance. When both of the locking bars are used,l it is necessary to use the key 13 to release the lower locking bar 5. The upper locking bar can be disengaged from the pin or stem 7 without difficulty by a person who is familiar with the lock, although an unauthorized party would find it practically impossible to withdraw the locking bar without instructions, since it must be remembered that the locking bar is on the inside of the door where it can not be seen, and the tortuous nature of the slot 6, with the notches 6b at the angular corners thereof, makes it diiiicult to disengage the pin from the slot.

Figs. 7, S and 9 illustrate a slight modification in which the notched seat Q5 at the upper end of the upright lever 16 is adapted to be engaged by the pin 19 of the upper locking bar for the purpose of swinging the upright lever to slide the lower locking bar 5 rearwardly into inoperative position. llllhen it is desired to use the lower locking bar 5 the upper locking bar 4 is first moved rearwardly and the pin 19 thereof caused to engage the upper end of the upright lever 1G to swing the same and slide the lower locking bar o into operative position. The upper locking bar 4 may then be moved into operative position, as in the previous instance. In order to unlock the door, the upper loelring bar 4 is iirst disengaged from the pin or stem 7 and then moved rearwardly to scat the lateral pin 19 thereof in the base of the notched seat Q5 of the upright lever 16. The spring detent 12 is then released by means of the key 13 and the lower bar 5 retracted by a. forward movement of the upper bar 4.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is

1. A lock including ay Casing, a locking bar slidable within the casing and having the lower corner of the nose thereof beveled, a tortuous slot being provided in the end of the locking bar and the slot being provided with angular corners having notches in coinmunication therewith, means for manipulating the locking bar, and a pin for engagement with the tortuous slot in the end of the bar, the mouth of the slot opening through the lower edge of the bar just to the rear of the beveled nose thereof.

2. A lock including a casing, upper and lower locking bars slidably mounted within the easing, manual means for manipulating one of the locking bars, a transverse lever pivotally mounted at an intermediate point in its length, one end of the lever being loosely connected to the other locking bar, while the opposite end of the lever is provided with a notched seat, a pin upon the Iirst mentioned locking bar for engagement with the notched seat of the lever upon an initial backward movement of the locking bur to Swing the level' and PI'OGCt the second locking bar into operative position, and key controlled means for retaining the second locking bar in operative position.

3. A lock including a` easing, upper and lower locking bars slidably mounted within i i TUO @oplet operative position when the first bar is given an initial backward movement, and key controlled means for retaining the second lock- 15 ing bar in operative position.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

GEORGE BLUME.

Witnesses:

BERNARD A. KEMPER, JACOB GUNDEL.

oi' thi patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

